Riviezzo said that he did not know that the veterinarian would use a firearm to euthanize the filly, and that he was not present when the filly was shot.

"I didn't know how they were going to euthanize her," Riviezzo said on Tuesday. "I was away. I got a phone call the next day that said that they put her down that way. One might argue how humane that is, but I will not get into that argument."